How can I effectively clean fireplace brick to restore its appearance and maintain its longevity?

To effectively clean fireplace brick and restore its appearance while maintaining longevity, start by removing any loose debris with a brush or vacuum. Then, mix a solution of warm water and mild detergent to scrub the bricks gently. For tougher stains, use a mixture of equal parts water and vinegar. Avoid harsh chemicals that can damage the brick. Rinse thoroughly and allow the bricks to dry completely before using the fireplace again. Regular cleaning and maintenance will help preserve the brick's appearance and longevity.